JPH02109502A - Injection molded safety shoes and its manufacture - Google Patents

Abstract

PURPOSE:To cause a thermoplastic resin layer, for which injection molding is executed between a cloth backing and a toe disaster preventing piece, to play a role as a buffering material, to obtain good feeling for wearing shoes and to improve safety by embedding the toe disaster preventing piece, which is internally mounted in a tip part and shaped almost in a toe cap shape, in thermoplastic resin. CONSTITUTION:A lining cloth 2 in a thin stocking shape is inserted to a last mold 3 and a toe disaster preventing pieced 1 is inserted to the toe part of this last mold 3. In such a case, the upper part of the toe disaster preventing piece 1 is abutted to a projection 10, which is projected and provided on the upper surface of the toe part in the last mold 3, and the lower edge of the piece 1 is limited by a projection 11 which is projected and provided on the lower surface of the toe part in the last mold 3. Simultaneously, a through hole 12, which is provided in the both sides of the toe disaster preventing piece 1, is held without fail in a condition that the toe disaster preventing piece 1 floats from the toe part surface of the last mold 3 by being fitted with a pole 7 which is slightly projected on the both side surfaces of the toe part in the last mold 3. After that, a space part 4 is formed by adding a side mold 13 and a bottom mode 14 and executing mold assembly. Then, after shoes materials 16 of PVC is injected and charged from an injecting hole 15 of the bottom mold 14 to this space part 4, the mold is detached.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to injection molded safety shoes having a toe disaster prevention piece inside to protect the feet when a heavy object is dropped on the feet, and the manufacture thereof. Regarding the method.

(B) Conventional technology Conventional safety shoes are made by fitting a thick lining fabric into the last mold, then fitting a toe disaster prevention piece to the toe area, and then covering the toe disaster prevention piece with a leather cover. Finally, mold the toe reinforcement rubber and sole rubber.

It is molded by filling the space created by the mold assembly with the side mold and bottom mold.

However, in this method, the toe disaster prevention piece is in direct contact with the lining fabric, and because the toe disaster prevention piece is hard, it hits the foot, and if a thicker material is used as the lining fabric, it is extremely troublesome to manufacture and handle. Furthermore, if you try to insert a cushioning material inside the toe disaster prevention piece in order to eliminate the foot contact, it will take more time and effort.

(c) Problems to be Solved by the Invention The present invention involves holding a toe disaster prevention piece in advance with a gap between the toe part of the last mold in a space formed by a proportion-type mold assembly, and then using thermoplastic Safety shoes made by injection molding of resin and a method for manufacturing the same, the toe safety shoes being molded by a simple operation of fitting the hole of the toe disaster prevention piece into the protruding protrusion provided on the side surface of the toe part of the last mold. The disaster prevention piece can be reliably held floating in the space, and the thermoplastic resin layer injection molded between the lining fabric and the toe disaster prevention piece acts as a cushioning material, making it comfortable to use. The purpose is to provide good and safe injection molded safety shoes.

(d) Means for solving the problem The first invention of the present invention relates to safety shoes made by injection molding thermoplastic resin on the surface of a sock-like lining fabric, and the inner part of the shoe is The present invention relates to injection molded safety shoes characterized in that a toe disaster prevention piece in the shape of a toe leather is embedded in a thermoplastic resin.

The second invention of the present invention is to fit a toe disaster prevention piece into the toe part of a space formed by a last mold fitted with a sock-like lining fabric, a side mold, and a bottom mold, and to fill the space with thermoplastic resin. The toe disaster prevention piece has both protrusions attached to both holes provided on both sides of the toe part of the last mold so as to be able to enter and exit from both sides of the toe part of the last mold. At least one protrusion protruding from the upper surface of the toe of the last mold is in contact with the upper inner surface of the toe disaster prevention piece, and the lower end of the toe disaster prevention piece is brought into contact with the lower surface of the toe of the last mold. At least one protruding fixing protrusion is placed in the space in contact with the space, and injection molding is performed between the toe disaster prevention piece and the lining fabric by injecting thermoplastic resin into the space. The present invention relates to a method of manufacturing injection molded safety shoes, characterized in that the thermoplastic resin is configured to serve as a cushioning material.

The third aspect of the present invention is that a toe disaster prevention piece having a substantially toe leather shape is held at the toe portion of a space formed by a last mold fitted with a sock-like lining fabric, a side mold, and a bottom mold. This relates to a method for manufacturing safety shoes whose parts are injection molded with thermoplastic resin, and the toe disaster prevention piece can be inserted into and exited from holes provided on both sides and the front side of the toe part of the last mold. The toe disaster prevention piece is configured such that the entire toe disaster prevention piece is embedded in the thermoplastic resin by injecting thermoplastic resin into the space after the protrusions that are freely attached are fitted. The present invention relates to a method for manufacturing injection molded safety shoes characterized by:

The injection molded safety shoes of the present invention include everything from short shoes to rain boots.

Furthermore, the holes provided in the toe disaster prevention piece are not limited to through holes, but also include holes or recesses.

(E) Embodiment FIGS. 1 and 2 are a cross-sectional view and a partially cutaway longitudinal cross-sectional view showing a state in which a toe disaster prevention piece (11) is installed in the toe part of the injection-molded safety shoes of the present invention. be.

Figure 3 shows a part of the last mold (3) fitted into the toe part of the last mold (3) with a sock-like lining fabric fitted inside the space (4) formed by each ratio mold. It is a cutaway sectional view.

In the first embodiment of the present invention, as shown in FIG. 3, a pair of holes (51, (5)) are provided on both sides of the toe portion of the last mold (3), and the holes (5) are provided with a pair of holes (51, (5)) on both sides of the toe portion of the last mold (3). Guide pieces (6) that follow both sides are screwed on, and then a rod (7) that slides in the through hole of the guide piece (6) is slidably inserted by its collar (8), and the rod ( A compression spring (9) is enclosed in a compressed state between the hole (5) and the rod (7).
The tip of the rod (7) slightly protrudes from the side of the last mold (3), and is pushed outward by a force greater than the elastic force of the compression spring (9). When pressed from above, it is sunk to the side of the last mold (3).

Furthermore, as shown in Fig. 2, there are two sets of protrusions QIQψ and QRIQl on the upper and lower surfaces of the toe part of the last mold (3), respectively.
) is protruded, the protrusion Ql on the upper surface is protruded simply to provide a distance from the toe disaster prevention piece +1), and the protrusion αυ on the lower surface is protruded.
is a seat-like protrusion whose height is such that it maintains the distance between the toe disaster prevention piece (1) and the bottom surface of the last mold (3), on which the lower end of the toe disaster prevention piece +1) is placed; It is positioned in contact with the back of aυ. As shown in Figs. 1 and 2, the toe disaster prevention piece (1) is made of a claw-like steel plate (of course, hard plastic etc. is also included), and the above-mentioned last mold (3) is attached to both sides of the toe disaster prevention piece (1). A pair of through holes are drilled on both sides of the toe portion of the rod, into which the head of the rod (7) held can be fitted.

Next, the manufacturing method of this example will be described. First, a thin sock-like lining cloth (2) is fitted to the last mold (3), and a toe disaster prevention piece (1) is fitted to the toe portion of the last mold (3). At this time, the upper part of the toe disaster prevention piece (1) comes into contact with the protrusion OI protruding from the upper surface of the toe part of the last mold (3), and its lower end contacts the protrusion OI protruding from the lower surface of the toe part of the last mold (3). limited by aυ. At the same time, the through holes 0 provided on both sides of the toe disaster prevention pieces (11) are connected to the rods (7) slightly protruding from both sides of the toe part of the last mold (3).
), the toe disaster prevention piece (1) is reliably held in a state floating above the toe surface of the last mold (3).

After that, side mold a hot water and bottom mold Q4
A space portion (4) is formed by adding 1 and forming a mold. A desired safety shoe can be manufactured by injecting and filling the PVC sheath material aS into this space (4) from the injection hole 0!9 of the bottom mold α (and then removing the mold).

The lining fabric (2) can be made of a thin material such as tricone or knitted fabric, so it can be easily fitted into the last mold (3) and blended well. Since the gap between the lining fabric (2) and the toe disaster prevention piece (1) can be maintained as specified, the flow of the sheath material Ql into this gap is improved and it is possible to reliably fill the gap.

A second embodiment of the present invention will be described with reference to FIG.

Since this embodiment can be formed by an easier operation than the first embodiment, the last mold (3
) A pair of rods (7) are provided on both sides of the toe part so that they can be pressed outward at all times, and in addition to (7), another rod (7) is provided on the front side of the toe. On both sides of the toe disaster prevention piece (11), a pair of through holes are drilled into which the heads of the rods (7) and (7) can be fitted, and in addition, on the front side, the toe of the last mold (3) is drilled. The rod (
There is a through hole @ that can be fitted with 7).

In short, the rod (7) installed in the last mold (3)
is configured so that its head is always protruding from the toe surface of the last mold (3), and when a pressing force greater than this elastic force is applied, it sinks down to the toe surface of the last mold (3). It is sufficient if it is done.

Also, if a vertical groove is provided on the head of the rod (7), the rod (7)
Even if the through hole of the toe disaster prevention piece (1) is fitted into the toe disaster prevention piece (1), the front and back of the toe disaster prevention piece (11) will be communicated by the vertical groove, and then the sheath material will be used during injection molding of the shoe material ae. Since the toe disaster prevention piece +11 is filled, the front and back sides of the toe disaster prevention piece +11 are connected and held together by the sheath material. If the through hole provided on the front side of the toe disaster prevention piece (1) is formed into a horizontal long hole,
Even if the accuracy of the toe disaster prevention piece (1) varies, it can be reliably fitted to the rod (7) provided on the front side of the toe of the last mold (3).

Thereafter, a desired injection-molded safety shoe can be manufactured by injecting and filling the PVC sheath material αe into the space (4) formed by each mold by the same operation as in the first embodiment, and then removing the mold.

In this example, three rods (
The toe disaster prevention piece (11) is provided with a through hole (goods) to match these rods (7), so the worker can remove the toe disaster prevention piece (1). By simply pressing the toe part of the last mold (3) so that it can be turned over, the rods (?), (η and the through holes (2), (2) on both sides are first fitted, and then the toe disaster prevention piece (1) is fitted. Just by slightly raising and lowering the front part of the last mold (
By fitting into the rod (7) provided on the front side of the toe of 3), it is reliably supported at three points and its operation is extremely simple.

(F) Effects of the Invention The present invention provides that the toe disaster prevention piece made of an extremely hard and strong material does not come into direct contact with the sock-like lining fabric, but instead is placed in a thermoplastic resin material equivalent to the torso, laces, and bottom. Since it is embedded and plays the role of a cushioning material, there is no need to attach a cushioning material between the toe disaster prevention piece and the toe lining fabric, and the foot does not come into direct contact with the toe disaster prevention piece when wearing the shoes. No damage to the feet.

Further, the present invention has protrusions that can protrude and retract from the side surface of the toe of the last mold, and holding protrusions that protrude from the upper and lower surfaces, respectively.
In order to put the toe disaster prevention piece over the toe part of the last mold, a through hole is drilled in the side surface of the toe disaster prevention piece by an extremely simple operation of just pressing from the toe side, and a protrusion protrudes from the toe side part of the last mold. The toe disaster prevention piece (
The upper lower surface and the lower end of 11 are held by protrusions protruding from the upper and lower surfaces of the toe part of the last mold, and the toe disaster prevention piece is attached to the last mold, side mold, and last mold fitted with a sock-like lining fabric. Since it is held in a floating state in the space formed by the molding, the toe disaster prevention piece and the toe part of the lining fabric can be reliably secured by a simple manufacturing process that involves injection and filling of shoe material made of thermoplastic resin. A thermoplastic resin material can be interposed between the toe and the toe disaster prevention piece to ensure that the toe disaster prevention piece does not touch the foot, and safe safety shoes that are comfortable to wear can be manufactured efficiently and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the toe portion of the injection-molded safety shoe of the present invention;
FIG. 2 is a partially cutaway vertical cross-sectional view of FIG. 1, and FIG. 3 is a partially cutaway cross-sectional view showing the assembled state of the proportion mold during injection molding. l-... Toe disaster prevention piece, 2...- Lining fabric, 3...-
Last mold, 4-1 space, 5...-hole, 6-
- Guide piece, 7 - rod. 8...-Tsuba, 9...-Compression spring, 10.11
-Protrusion, 12-Through hole. 13.--side mold, 14.--bottom mold,
15. Injection hole, 16-. Shoe material.

Claims (4)

[Claims] (1) In safety shoes made by injection molding thermoplastic resin on the outer fabric of the sock-like lining fabric, the toe disaster prevention piece, which is approximately toe leather-like, is entirely embedded in the thermoplastic resin. Injection-molded safety shoes characterized by: (2) A toe disaster prevention piece in the shape of a toe leather is held in the toe part of the space formed by the last mold fitted with a sock-like lining, side molds, and bottom mold, and thermoplastic resin is injected into the space. In the manufacturing method of molded safety shoes, the toe disaster prevention piece has two protrusions fitted into both holes provided on both sides of the toe part of the last mold so as to be able to come in and out of the toe part of the last mold. At least one protrusion protruding from the upper and lower surfaces of the toe of the last mold is placed in contact with the upper inner surface and lower end of the toe disaster prevention piece, and the space is filled with thermoplastic resin. 1. A method for producing injection-molded safety shoes, characterized in that the thermoplastic resin is injection-molded between the toe disaster prevention piece and the lining fabric by injecting the toe disaster prevention piece to serve as a cushioning material. (3) A toe disaster prevention piece in the shape of a toe strap is held at the toe part of the space formed by the last mold, side mold, and bottom mold fitted with a sock-like lining fabric, and a thermoplastic resin is placed in the space. In a method of manufacturing safety shoes made by injection molding, a protrusion is attached to the toe disaster prevention piece and holes provided on both sides and the front side of the toe part of the last mold so that the protrusion can enter and exit the toe part and the toe side. The injection molded safety device is characterized in that the entire toe disaster prevention piece is embedded in the thermoplastic resin by injecting thermoplastic resin into the space after the toe disaster prevention pieces are fitted into each other. How to make shoes. (4) The method for manufacturing injection molded safety shoes according to claim 3, wherein the hole provided on the side surface of the toe of the toe disaster prevention piece is a long hole.